[lwip-commits] [SCM] lwIP - A Lightweight TCPIP stack branch, master, updated. master_at_STABLE-2_0_0-37-g8ba7363

[Simon Goldschmidt]

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- Log -----------------------------------------------------------------
commit 8ba7363d11088fe37ceeaae5652d745ea3795342
Author: Ambroz Bizjak <address@hidden>
Date:   Thu Nov 24 11:27:34 2016 +0100

    Optimize passing contiguous nocopy buffers to tcp_write
    
    While TCP_OVERSIZE works only when tcp_write() is used with
    TCP_WRITE_FLAG_COPY, this new code achieves
    similar benefits for the use case that the caller manages their own
    send buffers and passes successive chunks of those to tcp_write()
    without TCP_WRITE_FLAG_COPY.
    
    In particular, if a buffer is passed to
    tcp_write() that is adjacent in memory to the previously passed
    buffer, it will be combined into the previous ROM pbuf reference
    whenever possible, thus extending that ROM pbuf rather than allocating
    a new ROM pbuf.
    
    For the aforementioned use case, the advantages of this code are
    twofold:
    1) fewer ROM pbufs need to be allocated to send the same data, and,
    2) the MAC layer gets outgoing TCP packets with shorter pbuf chains.
    
    Original patch by Ambroz Bizjak <address@hidden>
    Edited by David van Moolenbroek <address@hidden>
    Signed-off-by: goldsimon <address@hidden>

-----------------------------------------------------------------------

Summary of changes:
 CHANGELOG          |    3 +++
 src/core/tcp_out.c |   62 ++++++++++++++++++++++++++++++++++++++--------------
 2 files changed, 48 insertions(+), 17 deletions(-)


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